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<h2><span class="refentrytitle">Struct key_view</span></h2>
<p>boost::process::v2::environment::key_view — A view type for a key of an environment. </p>
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<h2 class="refsynopsisdiv-title">Synopsis</h2>
<div class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../mpi/reference.html#doxygen.environment_8hpp" title="Header &lt;boost/mpi/environment.hpp&gt;">boost/process/v2/environment.hpp</a>&gt;

</span>
<span class="keyword">struct</span> <a class="link" href="structboost_1_1process_1_1v2_1_1environment_1_1key__view.html" title="Struct key_view">key_view</a> <span class="special">{</span>
  <span class="comment">// types</span>
  <span class="keyword">typedef</span> <span class="identifier">char_type</span>                                                    <a name="doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1a8efcc139bc751cb3fdd747d4ed067a15"></a><span class="identifier">value_type</span><span class="special">;</span>      
  <span class="keyword">typedef</span> <span class="identifier">key_char_traits</span><span class="special">&lt;</span> <span class="identifier">char_type</span> <span class="special">&gt;</span>                                 <a name="doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1afb53732cca6d32994d61a6ea99083bda"></a><span class="identifier">traits_type</span><span class="special">;</span>     
  <span class="keyword">typedef</span> <span class="identifier">basic_string_view</span><span class="special">&lt;</span> <span class="identifier">char_type</span><span class="special">,</span> <span class="identifier">traits_type</span> <span class="special">&gt;</span>                  <a name="doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1a5e9846c79dca2b6546155f2d639494bb"></a><span class="identifier">string_view_type</span><span class="special">;</span>
  <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span> <span class="identifier">char_type</span><span class="special">,</span> <span class="identifier">key_char_traits</span><span class="special">&lt;</span> <span class="identifier">char_type</span> <span class="special">&gt;</span> <span class="special">&gt;</span> <a name="doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1a7b5be226127999350867f9dedcdc3dfe"></a><span class="identifier">string_type</span><span class="special">;</span>     

  <span class="comment">// <a class="link" href="boost_interprocess_header_reference/classboost_1_1interprocess_1_1basic__managed__external__buffer.html#id33-bb">public member functions</a></span>
  <a class="link" href="structboost_1_1process_1_1v2_1_1environment_1_1key__view.html#doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1a9d042e3aa65dfeefbd3a492c883c44de"><span class="identifier">key_view</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  <a class="link" href="structboost_1_1process_1_1v2_1_1environment_1_1key__view.html#doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1a28d1e02017a7628178b27046afe4967e"><span class="identifier">key_view</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="structboost_1_1process_1_1v2_1_1environment_1_1key__view.html" title="Struct key_view">key_view</a> <span class="special">&amp;</span><span class="special">)</span> <span class="special">=</span> <span class="keyword">default</span><span class="special">;</span>
  <a class="link" href="structboost_1_1process_1_1v2_1_1environment_1_1key__view.html#doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1ac3238d595eed1325aaa7133e841318d2"><span class="identifier">key_view</span></a><span class="special">(</span><a class="link" href="structboost_1_1process_1_1v2_1_1environment_1_1key__view.html" title="Struct key_view">key_view</a> <span class="special">&amp;&amp;</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Source<span class="special">,</span> 
           <span class="keyword">typename</span> <span class="special">=</span> <span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">enable_if</span><span class="special">&lt;</span><span class="identifier">is_constructible</span><span class="special">&lt;</span><span class="identifier">string_view_type</span><span class="special">,</span> <span class="identifier">Source</span><span class="special">&gt;</span><span class="special">::</span><span class="identifier">value</span><span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span><span class="special">&gt;</span> 
    <a class="link" href="structboost_1_1process_1_1v2_1_1environment_1_1key__view.html#doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1a6df80626ce02d18b4058574893005d7f"><span class="identifier">key_view</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">Source</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  <a class="link" href="structboost_1_1process_1_1v2_1_1environment_1_1key__view.html#doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1a9023a61edbca8c5020df8277cf93c7ec"><span class="identifier">key_view</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">char_type</span> <span class="special">*</span><span class="special">)</span><span class="special">;</span>
  <a class="link" href="structboost_1_1process_1_1v2_1_1environment_1_1key__view.html#doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1a860e00797d653a312c8540550c205d1a"><span class="identifier">key_view</span></a><span class="special">(</span><span class="identifier">char_type</span> <span class="special">*</span><span class="special">)</span><span class="special">;</span>
  <a class="link" href="structboost_1_1process_1_1v2_1_1environment_1_1key__view.html#doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1aa569b3a64596723100104ffba7fb69e1"><span class="special">~</span><span class="identifier">key_view</span></a><span class="special">(</span><span class="special">)</span> <span class="special">=</span> <span class="keyword">default</span><span class="special">;</span>
  <a class="link" href="structboost_1_1process_1_1v2_1_1environment_1_1key__view.html" title="Struct key_view">key_view</a> <span class="special">&amp;</span> <a class="link" href="structboost_1_1process_1_1v2_1_1environment_1_1key__view.html#doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1ad433820e05a99f6ccd9c78ea1961c9e2"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="structboost_1_1process_1_1v2_1_1environment_1_1key__view.html" title="Struct key_view">key_view</a> <span class="special">&amp;</span><span class="special">)</span> <span class="special">=</span> <span class="keyword">default</span><span class="special">;</span>
  <a class="link" href="structboost_1_1process_1_1v2_1_1environment_1_1key__view.html" title="Struct key_view">key_view</a> <span class="special">&amp;</span> <a class="link" href="structboost_1_1process_1_1v2_1_1environment_1_1key__view.html#doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1a0e26924c02f21725fe7f937505faffac"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><a class="link" href="structboost_1_1process_1_1v2_1_1environment_1_1key__view.html" title="Struct key_view">key_view</a> <span class="special">&amp;&amp;</span><span class="special">)</span><span class="special">;</span>
  <a class="link" href="structboost_1_1process_1_1v2_1_1environment_1_1key__view.html" title="Struct key_view">key_view</a> <span class="special">&amp;</span> <a class="link" href="structboost_1_1process_1_1v2_1_1environment_1_1key__view.html#doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1a1214102e017a275912c14603e6091c30"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><span class="identifier">string_view_type</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">void</span> <a class="link" href="structboost_1_1process_1_1v2_1_1environment_1_1key__view.html#doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1a4744755f00d62509e3a01fd1668794a7"><span class="identifier">swap</span></a><span class="special">(</span><a class="link" href="structboost_1_1process_1_1v2_1_1environment_1_1key__view.html" title="Struct key_view">key_view</a> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
  <span class="identifier">string_view_type</span> <a class="link" href="structboost_1_1process_1_1v2_1_1environment_1_1key__view.html#doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1ab75ca611107663a54ffefd5343a5c458"><span class="identifier">native</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
  <a class="link" href="structboost_1_1process_1_1v2_1_1environment_1_1key__view.html#doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1a9494d98a8ac187e821056e8b69ff0e81"><span class="keyword">operator</span> <span class="identifier">string_view_type</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <span class="keyword">int</span> <a class="link" href="structboost_1_1process_1_1v2_1_1environment_1_1key__view.html#doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1adb760fcb0d163717fe9cbdfaca3a56c5"><span class="identifier">compare</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="structboost_1_1process_1_1v2_1_1environment_1_1key__view.html" title="Struct key_view">key_view</a> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
  <span class="keyword">int</span> <a class="link" href="structboost_1_1process_1_1v2_1_1environment_1_1key__view.html#doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1a0b7625f94135c1b28bf98e37b7b102fd"><span class="identifier">compare</span></a><span class="special">(</span><span class="identifier">string_view_type</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <span class="keyword">int</span> <a class="link" href="structboost_1_1process_1_1v2_1_1environment_1_1key__view.html#doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1aa437e0e36df719fb995bb06f6eeb6bd9"><span class="identifier">compare</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">value_type</span> <span class="special">*</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> CharT<span class="special">,</span> <span class="keyword">typename</span> Traits <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">char_traits</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span><span class="special">,</span> 
           <span class="keyword">typename</span> Alloc <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">allocator</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="special">&gt;</span> 
    <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="identifier">Alloc</span> <span class="special">&gt;</span> 
    <a class="link" href="structboost_1_1process_1_1v2_1_1environment_1_1key__view.html#doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1a32af10f8e43f885f9aca695da7bdc147"><span class="identifier">basic_string</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">Alloc</span> <span class="special">&amp;</span> <span class="special">=</span> <span class="identifier">Alloc</span><span class="special">(</span><span class="special">)</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <a class="link" href="structboost_1_1process_1_1v2_1_1environment_1_1key__view.html#doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1abe40f95d4ab4211a22cff12325c9e88a"><span class="identifier">string</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <span class="identifier">std</span><span class="special">::</span><span class="identifier">wstring</span> <a class="link" href="structboost_1_1process_1_1v2_1_1environment_1_1key__view.html#doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1a31aa18bc5578778149ae6586f3399755"><span class="identifier">wstring</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <span class="identifier">string_type</span> <a class="link" href="structboost_1_1process_1_1v2_1_1environment_1_1key__view.html#doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1ad4192f403a66b5d1f779225ba6d69181"><span class="identifier">native_string</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <span class="keyword">bool</span> <a class="link" href="structboost_1_1process_1_1v2_1_1environment_1_1key__view.html#doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1aee17b828ff0bcdffea1814b805608a01"><span class="identifier">empty</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <span class="keyword">const</span> <span class="identifier">value_type</span> <span class="special">*</span> <a class="link" href="structboost_1_1process_1_1v2_1_1environment_1_1key__view.html#doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1a6651559be5741c120d034c15f3014292"><span class="identifier">data</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="structboost_1_1process_1_1v2_1_1environment_1_1key__view.html#doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1a1d1c34fe28ffdf59292029296080bf1b"><span class="identifier">size</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="id-1.3.30.5.8.5.7.4"></a><h2>Description</h2>
<div class="refsect2">
<a name="id-1.3.30.5.8.5.7.4.2"></a><h3>
<a name="id33-bb"></a><code class="computeroutput">key_view</code> public member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem"><pre class="literallayout"><a name="doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1a9d042e3aa65dfeefbd3a492c883c44de"></a><span class="identifier">key_view</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><a name="doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1a28d1e02017a7628178b27046afe4967e"></a><span class="identifier">key_view</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="structboost_1_1process_1_1v2_1_1environment_1_1key__view.html" title="Struct key_view">key_view</a> <span class="special">&amp;</span> p<span class="special">)</span> <span class="special">=</span> <span class="keyword">default</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><a name="doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1ac3238d595eed1325aaa7133e841318d2"></a><span class="identifier">key_view</span><span class="special">(</span><a class="link" href="structboost_1_1process_1_1v2_1_1environment_1_1key__view.html" title="Struct key_view">key_view</a> <span class="special">&amp;&amp;</span> p<span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Source<span class="special">,</span> 
         <span class="keyword">typename</span> <span class="special">=</span> <span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">enable_if</span><span class="special">&lt;</span><span class="identifier">is_constructible</span><span class="special">&lt;</span><span class="identifier">string_view_type</span><span class="special">,</span> <span class="identifier">Source</span><span class="special">&gt;</span><span class="special">::</span><span class="identifier">value</span><span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span><span class="special">&gt;</span> 
  <a name="doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1a6df80626ce02d18b4058574893005d7f"></a><span class="identifier">key_view</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">Source</span> <span class="special">&amp;</span> source<span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><a name="doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1a9023a61edbca8c5020df8277cf93c7ec"></a><span class="identifier">key_view</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">char_type</span> <span class="special">*</span> p<span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><a name="doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1a860e00797d653a312c8540550c205d1a"></a><span class="identifier">key_view</span><span class="special">(</span><span class="identifier">char_type</span> <span class="special">*</span> p<span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><a name="doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1aa569b3a64596723100104ffba7fb69e1"></a><span class="special">~</span><span class="identifier">key_view</span><span class="special">(</span><span class="special">)</span> <span class="special">=</span> <span class="keyword">default</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><a class="link" href="structboost_1_1process_1_1v2_1_1environment_1_1key__view.html" title="Struct key_view">key_view</a> <span class="special">&amp;</span> <a name="doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1ad433820e05a99f6ccd9c78ea1961c9e2"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="structboost_1_1process_1_1v2_1_1environment_1_1key__view.html" title="Struct key_view">key_view</a> <span class="special">&amp;</span> p<span class="special">)</span> <span class="special">=</span> <span class="keyword">default</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><a class="link" href="structboost_1_1process_1_1v2_1_1environment_1_1key__view.html" title="Struct key_view">key_view</a> <span class="special">&amp;</span> <a name="doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1a0e26924c02f21725fe7f937505faffac"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><a class="link" href="structboost_1_1process_1_1v2_1_1environment_1_1key__view.html" title="Struct key_view">key_view</a> <span class="special">&amp;&amp;</span> p<span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><a class="link" href="structboost_1_1process_1_1v2_1_1environment_1_1key__view.html" title="Struct key_view">key_view</a> <span class="special">&amp;</span> <a name="doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1a1214102e017a275912c14603e6091c30"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><span class="identifier">string_view_type</span> source<span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="keyword">void</span> <a name="doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1a4744755f00d62509e3a01fd1668794a7"></a><span class="identifier">swap</span><span class="special">(</span><a class="link" href="structboost_1_1process_1_1v2_1_1environment_1_1key__view.html" title="Struct key_view">key_view</a> <span class="special">&amp;</span> other<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="identifier">string_view_type</span> <a name="doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1ab75ca611107663a54ffefd5343a5c458"></a><span class="identifier">native</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><a name="doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1a9494d98a8ac187e821056e8b69ff0e81"></a><span class="keyword">operator</span> <span class="identifier">string_view_type</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="keyword">int</span> <a name="doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1adb760fcb0d163717fe9cbdfaca3a56c5"></a><span class="identifier">compare</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="structboost_1_1process_1_1v2_1_1environment_1_1key__view.html" title="Struct key_view">key_view</a> <span class="special">&amp;</span> p<span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="keyword">int</span> <a name="doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1a0b7625f94135c1b28bf98e37b7b102fd"></a><span class="identifier">compare</span><span class="special">(</span><span class="identifier">string_view_type</span> str<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="keyword">int</span> <a name="doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1aa437e0e36df719fb995bb06f6eeb6bd9"></a><span class="identifier">compare</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">value_type</span> <span class="special">*</span> s<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> CharT<span class="special">,</span> <span class="keyword">typename</span> Traits <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">char_traits</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span><span class="special">,</span> 
         <span class="keyword">typename</span> Alloc <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">allocator</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="special">&gt;</span> 
  <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="identifier">Alloc</span> <span class="special">&gt;</span> 
  <a name="doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1a32af10f8e43f885f9aca695da7bdc147"></a><span class="identifier">basic_string</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">Alloc</span> <span class="special">&amp;</span> alloc <span class="special">=</span> <span class="identifier">Alloc</span><span class="special">(</span><span class="special">)</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <a name="doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1abe40f95d4ab4211a22cff12325c9e88a"></a><span class="identifier">string</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="identifier">std</span><span class="special">::</span><span class="identifier">wstring</span> <a name="doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1a31aa18bc5578778149ae6586f3399755"></a><span class="identifier">wstring</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="identifier">string_type</span> <a name="doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1ad4192f403a66b5d1f779225ba6d69181"></a><span class="identifier">native_string</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="keyword">bool</span> <a name="doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1aee17b828ff0bcdffea1814b805608a01"></a><span class="identifier">empty</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="keyword">const</span> <span class="identifier">value_type</span> <span class="special">*</span> <a name="doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1a6651559be5741c120d034c15f3014292"></a><span class="identifier">data</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="doxygen.structboost_1_1process_1_1v2_1_1environment_1_1key__view_1a1d1c34fe28ffdf59292029296080bf1b"></a><span class="identifier">size</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre></li>
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